Scraper



April7,1942. J- MCORBETT ETAL 2,278,511

April 7, 1942. J. M. coRBr-:TT E1- AL 2,278,511

SCRABER Filed July 18, 1938 8Sheets-Sheet 2 J. M. CORBETT ET AL 2,278,511

scRAPER Filed July 1a, 195s e Smets-sheet 5 April 7 1942.

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NNN n l April 7, 1942. J. M. CQRBETT ET AL 2,278,511

SGRAP'ER Filed July 18, 1958 8 Sheets-Sheet 4 A TIGR/V5.1

April 7, 1942.l J. M. cRB-r'r ET AL 2,278,511

SCRAPER Filed July 18, 1958 8 Sheets-Sheet 5 /I/ENOR/. BY

A TTORNEY April7, 1942. 1M, CORBETT ETAL 2,278,511

SCRAPER Filed July. 18, 1958 8 Sheets-Sheet 6 A TTU/11,1751' April 7,1942. J. M. CRBETT ETAL 2,278,511 Y SCRAPER 'y Filed July l8,` 1958 8 Sheets-Sheet 7 simil April 7, 1942. J. M. coRBl-:T'r ET AL A2,278,511

SCRAPER Filed July 18, 1958 8 Sheets-Sheet 8 1N VENTok `-ATTORNEY Patented Apr. 7, 1942 SCRAPER John M. Corbett, Huntington Park, and Robert Bruce Magee, Los Angeles, Calif., assgnors, by mesne assignments, to The Buckeye Traction Ditcher Company, Findlay, Ohio Application July 18, 1938, Serial No. 219,806

7 Claims.

Our invention relates to earth scrapers of the type adapted to gather earth from a surface over which the scraper is being moved, to carry the earth to a location where it is desired to dump the same, and to dump the earth at the desired location.

It is an object of our invention to provide an earth scraper of the character described which includes a main bowl and an auxiliary bowl or apron which cooperates with the forward part thereof in order that the main bowl may be completely lled, thus enabling the scraper to carry relatively large loads.

Itis one of the objects of our invention to provide a unique apron operating means whereby the apron is moved into loading, carrying, and dumping positions in response to corresponding positions of the main bowl.

It is a furtherobject of our invention to provide "a simple apron operating means in which a cam and engager arrangement is employed which is of sturdy fool-proof construction.

It is another object of our invention to provide an earth scraper in which the main frame is pivoted around rear wheels and in which the forward part of the main frame is raised and lowered in order to bring the blade of the scraper into proper operating position, the control means therefor being preferably a cable and sheave arrangement.

It is another object of the invention to provide a scraper in which the bowl is operated by va cable and is moved thereby into carrying, digging, and dumping positions.

It is a still further object of our invention to provide a scraper in which the bowl is moved into its various digging positions by a cable, and in which the bowl when in digging position is supported by the cable and when in carrying position is lowered into engagement with the frame so that during carrying position the cable is not required to take any load.

It is an additional object of our invention to provide a scraper of the general character pointed out above in which the main frame is pivoted on wheels at its rearward part and is vertically adjustable on a forward carriage structure, which carriage structure has wheels which are movable in response to undulation in the surface over which the scraper is being moved, and in which the front Wheels do not in any way affect the horizontal position of the main frame.

It is a still further object of our invention to provide a scraper in which the bowl is returned from dumping position to digging or carrying polil sition by the action of gravity and in which aux-- iliary means is provided for initiating the downward movement of the bowl.

In the following detailed description we will describe a preferred form of our invention.' This form of our invention includesk in combination the various elements and sub-combinations comprising our` invention. Other structures may be designed incorporating the features of our invention, and we therefor do not wish to be limited tov tion will be brought outin the following part' of the specification.

Referring to the' drawings which v'are for illustrative purposes only:

Fig. 1 is a side elevation showing the scraper in digging or scraping position.A

Fig, 2 is a side elevation showing they scraperV in carrying position, the dumping position of the scraper bowl being shown in dotted lines in this view.

Fig. 3 is a plan view` of the scraper in digging position.

Fig. 4 is a. front elevation of the scraper showing the apron thereof in lowered position prior to the raising of the scraper frame to carrying position.

Fig. 5 is a rear elevation of the scraper in scraping position, the left-hand portion of this View being sectioned on a plane indicated by the line 5-5 of Fig. 1.

Fig. 6 is an enlarged fragmentary sectional View taken as indicated by the line 6-6 of Fig. 3.

Fig. '7 is an enlarged fragmentary sectional View similar to Fig. 6 but showing the apron operating cam assembly in position assumed when the apron is lowered.

Fig. 8 is an enlarged fragmentary section taken as indicated by the line 8-8 of Fig. 4.

Fig.- 9 is an enlarged section taken as indicated by the line 9-9 of Fig. 1.

Fig. 10 isv an enlarged fragmentary sectional view taken-as indicated by the lines lD-I oi Figs. 3 and 1.

Fig. 11 is a fragmentary sectional View taken as indicated by the lines II--ll of Figs. 1 and 3.

Fig. 12 is an enlarged fragmentary section taken as indicated by the line |2-l2 of Fig. 3.

Fig. 13 is a fragmentary section taken as india cated by the line I3-l3 of Fig; 12.

The present invention includes a rugged frame I5 which travels on wheels I9 and I'I, a laterally directed scraper blade I8 which is adapted to engage the ground when the device is in working position, as shown in Fig. l, a bowl I9 which receives the load of earth or similar material which passes over the blade I8 when the device moves forwardly, an auxiliary load carrying member or apron for obstructing the mouth of the bowl I9 when the device is in carrying position, as shown in Fig. 2, elevator means 2I for raising the iront end of the frame I5 from its position of Fig. l to its position in Fig. 2, bowl operating means 22 for moving the bowl I9 through the working, carrying, and dumping positions thereof, and apron operating means 23 for moving the apron 29 from its lowered position, as shown in Fig. 2, to its raised position in Fig. 1.

As shown in Fig. 3, the frame I5 includes fabricated side means symmetrically formed in right and left-hand relation. These side means 24 each include a front portion 25 extending rearwardly and outwardly fromv a head 26. The portions 25 constituting the forward ends of the beams 24 are fabricated from flat steel plates so as to be of hollow rectangular cross-section. Parallel and essentially horizontal side portions 21 extend rearwardly from the ends of the diagonal portions 25, these side portions 21 being likewise fabricated from steel plates welded together so as to form tubular structural elements varying in cross-section, as shown in Figs. 1 and 3, and having their rear ends 28 connected to vertical posts 29, from the lower portions of which foot portions 30 rearwardly extend, and on the rearward ends thereof carry brackets 3l which in turn carry axles 32 in inward projecting relation to support the rear wheels I'I.

As shown in Fig. 10, the large front part of each side portion 21 includes a tcp plate 33, a side plate 34, a bottom plate 35, and an inner side plate 36 which is cut away at 3T, and of which the cut-away portion is replaced by the upper corner 38 of a guard plate 39, the upper portion of which extends back, as indicated at 40 in Fig. 11, so as to form the inner wall of the rear part 21a of the side portion 21. The rear part 4I of the guard or gusset plate 39 extends to and enters into the formation of the rear post 29, and the lower part 42 of the plate 39 extends below the post 29, and at a distance ahead of the post 29 carries one end of a horizontal shaft 43. The scraper blade I 8 has its ends connected to the lower portions of the plates 39 in a position forward of the shaft 43. The blade I9 comprises a reversible and replaceable plate 44, as best shown in Fig. 12, which is secured by means of screws 45 to the permanent supporting structure 46 of the blade I9, which supporting structure is fabricated by welding together of steel plates. The front edge 41 of each plate curves downward and rearward from the upper forward corner thereof to a point adjacent the lower edge of the scraper blade I8. As will be seen in Figs..1, 10 and 12, a triangular portion 48 of each guard plate 39 is flared outwardly and laterally to form guide plates which converge rearwardly toward the blade I8 to guide materials thereto. A reinforcing member 49 is welded to the exterior of each guard plate 39 in a position near the lower edge thereof and extending substantially horizontally, this reinforcing member 49 comprises a plate bent to form a. .structural angle having an upper leg 59. Fig, 11, which is shorter than the lower leg 5I thereof. This angle member 49 is placed against the plate 39 with the webs or legs 50 and 5I thereof lying against the face of the plate 39 and with the corner 52 thereof projecting outwardly. The member 49 extends across the lower end of the post 29 and to the rear end of the foot portion 3D where its legs 50 and 5I are welded to that portion of the plate 39, identified by numeral 53, which extends rearwardly beyond the lower part of the post 29 and forms the vertical web of the rearwardly extending foot portion 30. From the rear face of the post 29 a steel channel 54 slopes downward to meet the bracket 3| at the rear end of the foot portion 39, this channel member 54 being welded to the rearwardly extending portion 53 of the side plate 39, as shown in Fig. 1. As best shown in Fig. 5, a structural channel 55 is extended laterally across the back of the frame I5, between the foot portion 39, the ends of this channel being welded at 5B to the inner faces of the foot portions 30. Diagonally placed I-beams are welded to the lower face of the channel 55 and to the lower parts of the foot portions 39 in positions to form diagonal struts. On the inner faces of the rearward parts of the foot portions 3D angle members 49a, symmetrical to the angle members 49, are welded in cooperating relation to the rear ends of the members 49 to stiffen the rear ends of the foot portions 39. As shown in Figs. 1 and 10, curved angles 58 are secured to the forward portions of the guard plates 39 adjacent the curved edges 41 thereof and extending upwardly from the forward ends of the reinforcing members 49, there being wear plates 59 removably secured to the lower ends of the angles 58. The center portion of the frame I5 is reinforced by the lateral box beam 60 which is disposed substantially centrally between the head 26 and the posts 29.

The bowl I9, as shown in Fig. 12, has a tube 6I at its forward lower edge, by which it is hinged on the lateral shaft 43. This bowl I9 includes a bottom wall 62, a back 63, and side walls 64 comprising plates having sloped forward edges 65 which are flared outwardly to form lips which lie in close proximity to the guard walls 39, as shown in Fig. 11. The bottom and back walls 62 and 63 are formed from a pair of steel plates 66 and 6'1 bent, as indicated at 68, and being supported in spaced relation by use of filler members 69 and T9, which filler members are preferably structural channels and wood strips, as shown in Fig. 13. At the upper edge of the wall 63 an I-beam II is secured, end portions of the same being cut away to accommodate sheaves 'I2 and 13, as shown in Figs. 3 and l2. At each end of the beam 'II a pulley block 'I4 is secured to the bowl I9, these pulley blocks 'I4 having sheaves l5, '16, l1, and 1B, as shown in Fig. 3, over which cable means 'I9 is passed, and which cable means is operative to swing the bowl I9 on the lateral shaft 43. The sheaves 'I2 and 'I3 serve as cross-over pulleys between the blocks 14, and aligned with the lower edges of the sheaves 'i2 and I3 there is a guide tube 80 for the transverse portion of the cable means, as also shown in Fig. 5.

The apron 29 comprises a curved lower wall 8|, a pair of end plates 82, and a pair of arms or levers 93 extending, as shown in Fig. 2, in upward thereto, as shown in Figs. and 11, and the arms are of such length that the inner or lower edge 85 of the apron 20 will follow along the curve defined by the edges 41 of the guard walls 39 when the arms 83 are swung upwardly from their position in Fig. 2 to the positionthereof in Fig. 1. When the apron is in lowered position the lower edge 85 thereof will overlie the'lower portion of the scraper blade I8, as shown in Fig. 2, and the apron 20 will serve as a gate across the mouth of the bowl I9 to prevent spillage of any portion of the load therefrom while the device is being moved to a location wherein it is desired to dump the load.

The arms 83 are cut from flat plates 86 and have upwardly bent portions 81 at their upper ends, to the inner faces of which oval plates 88, as shown in Figs. 7 and 11, are secured in spaced relation by means of walls 89 which are perpendicular to the faces of the plates 86 and 88. The pivot pins 84, which are carried by the frame I 5, pass through the upper ends of the plates 89 and 88. The plates 86 are further reinforced by means of angles 90 which are welded to the inner faces thereof in positions, such as indicated in Fig. 7. Between the plates 86 and 89, in a position spaced below the hinge pins 84, pins SI are extended, these pins engaging the forward ends of links 92 forming a part of the apron operating means 23, such links 92 passing through openings 93 in the vertical posts 29, as 1 shown in Figs. 6 and '7. The links 92 cooperate with cam members 94to form toggle means operative to swing the levers 83 from their positions in Figs. 2 to their positions in Fig. l.

The cam members 94 each include a bossv 95 having a lateral opening to receive a pivot pini-96 carried between plates 91 which project upwardly from the foot portions of the frame. In spaced relation to the pin 96, the member 94 carries a crank pin 98 which passes through a slot 99 in the rear end of a link 92. The cam member 94 has a notch or pocket |00 adapted to be engaged by a projection IOI which extends laterally from the bowl I9 during specied portions of the movement of the bowl, the purpose of this engagement being to rotate the cam member 94 between the positions thereof shown in Figs. 1, 2, 6, and '7. In Figs. 1 and 6 the bowl I9 is shown in scraping position. At this time the bowl I9 is raised so that the projections IliI are raised from their lowermost position and are disposed at the mouths of the pockets |00. The rear ends of the links 92 are at this time in engagement with stops |02, and the crank pins 98 are nearly aligned with the pins 9| and 96, so that the toggles, of which the links 92 form a part, are extended and the lever arms 83 are held in raised position. It will be noted that, as shown in Fig. 6, the centers of the crank pins 98 are below lines a-b extended through the centers of the pins 9| and 96, so that the end thrust exerted against the links 92 by the pins 9| will tend to break the toggles downward, thereby holding the same firmly against 'the stops |02. Should it now be desired to lower the apron 20 from raised position, as shown in Fig. l, to lowered position, as shown in Fig. 2, the bowl I9 is merely allowed to rotate downwardly and rearwardly from its position of Figs. l and 6 to the position thereof shown in Fig. 7. 'I'he projections |0I, which are preferably flanged rollers mounted on laterally projecting shafts |03, move from the position thereof in Fig. 6, as indicated by the arrow |94, to the position thereofvinFig. '7.

arms 8,3 to carry the apron 20 into engagementwith the blade member I8.

The mouth of the bowl I9 will now be closed and the scraper `may be converted to carrying position by raising the forward end of the frame I5 by use of the elevator means 2| in a manner to be hereinafter described, thereby swinging the frame I5 upwardly around the axis of the rear wheels I 1 into raised position, as shown in Fig. 2, at which time the scraper blade I8, the apron 20, and the bowl I9 will be raised from the ground level |06. When the scraper device has been moved to desired position for dumping, this may be accomplished without lowering the frame I5 by merely rotating the bowl I9 upwardly from carrying position thereof shown in Fig. 2 to raised or dumping position indicated by dotted lines |01. This movement of the bowl I9 will automatically raise the apron 20 to the position thereof indicated by broken lines |98. During the first part of the upward movement of the :bowl I9, the projections |0I- move upwardly from their position shown in Fig. 2 and Fig. 7 through the position thereof shown in Fig. 6. Referring to Fig. 7, as the projections |0| are carried upwardly they are brought into engagement with the front walls |09 of the cam members 94, causing the cam members 94 to swing forwardly and carry the crank pins 98 forwardly and downwardly toward the stops |02, thereby moving the links 92 and the levers 83 into the positions thereof shown in Fig. 6. At this time the toggles consisting of the links 92 and portions of the cam members 94 will be extended and will be deflected below the line a--b of Fig. 6 so as to be locked in such extended position. At the same time the mouths of the pockets |00 will be spaced upwardly so that as the upward movement of the bowl I9 is continued the projections or cam engagers IOI will move upwardly and forwardly, as indicated by the arc |09 of Fig. 6. Whenever the projections I0| are in or above the position thereof shown in Fig. 6, the apron operating mechanism will be in actuated condition.

After the load is dumped, the bowl I9 may be I; swung back from the dumping position |01 thereof to scraping position as shown in full lines in Fig. 1, at which time the projections IOI will be ready for engagement with the walls of the pockets |00, so that after a load has been picked up by the bowl I9 the apron 28 may be lowered merely by dropping the bowl I9 from its position of Fig. 1, thereby causingy release of the apron operating mechanism as described relative to Figs. 6 and '7. To cause positive rearward movement of the bowl I9 from the position thereof as shown in dotted lines |01 of Fig. 2, springs |I0 are supported by the cross-beam 80 by use of brackets III, as shown in Fig. 10, and in such position that the upper ends of these springs I I 0 will be engaged by plates or brackets I I2 secured to the side walls 64 of the bowl I9, as shown in Figs. 1 and 3. As the bowl I9 is swung into fully raised position, as indicated by dotted lines |01 in Fig. 2 the springs I|0 will be engaged by the plates I I 2 and will be'thereby compressed so that they will thereafter exert against the bowl |9 a force tending to swing the same in a rearward direction when the pull exerted by the cable means 19 is slacked off.

As shown in Fig. 4, the front wheels I6 are carried at the ends of an axle ||3 which has a draft bar ||4 extending forwardly therefrom and having its forward end adapted for attachment of a draft clevis I I5. The shaft or axle I3 is mounted for rotation relative to two axes, namely, a vertical axis, to give the axle ||3 a steering movement, and a horizontal axis extending transversely through the center of the axle |3 so that the wheels I6 may move up and down in opposite directions as the same pass over uneven ground. A pin ||6 passes through substantially the center of the axle ||3 from front to rear thereof, and the ends of such pin are received in bosses ||1 carried by the sizer plates I IB of a head |I9 adapted to rotate on a vertical axis. The upper part of the head I I9 includes a thrust plate from which a pin |2| extends upwardly into a vertical tube |22 which is secured within the lower end of the vertical post or column |23 by means of spacer blocks |24, as shown in Figs. 8 and 9.

The column |23 is of hollow square cross-section, and as shown in Figs. 2 and 9, consists of .a pair of structural angles |25 placed with the flange edges |26 thereof in engagement, and being secured by welds |21 between the adjoining iiange edges. Slide plates |28 are secured to the side faces of the column |23.

The head 26 at the forward end of the frame I5, as shown in Figs. 1, 2, 4. and 9, comprises a pair of heavy side plates |29 and |30 which extend vertically on opposite sides of the column |23 and have slide plates |3| secured therein for engagement with the slide plates |28 of the column |23. The diagonal members 25, forming the front part of the frame I5, are welded to the side plates |29 and |30, as indicated by the numeral |32.

The plates |29 and |30 have portions |33 and |33 which project rearwardly beyond the plane dened by the rear face |34 of the column |23. Across the rear edges of these plates |29 and |39 a back plate |35 is secured, this back plate having projecting Iiange portions |36. In the space |31 between the rear face |34 of the column |23 and the back plate |35 a pair of rollers |38 are mounted so as to roll in engagement with the rear face |34 as the head 26 moves vertically on the column |23. These rollers |38 have projecting shafts |39 which extend through openings in the plate portions |32 and |33 and engage bearing blocks |40 which are horizontally slidable in housings |4| and are moved toward the column |23 by wedge blocks 42 which are vertically movable and have studs |43 which project out through vertical slots in the extending portions |36 of the back plates |35, nuts |44 being provided to clamp the wedge blocks |42 in desired position.

The side plates |29 and |30 also have forwardly projecting portions |45 and` |46 which extend forwardly of the plane defined by the front face |41 of the column |23. A pair of horizontal shafts |48 are extended across the space between the plates |29 and |30 in such position that these shafts |48 may support rollers |49 in engagement with the front face |41 of the column |23,

' such rollers |49 being preferably positioned near the upper and lower edges of the plates |29 and |30, as shown in Fig. 1. A front plate |59 is extended across the front edge of the side plate |29` in a position substantially parallel to the front face |41 of the column |23, this plate |59 being in spaced relation to the front face |41 and being welded to the front edge of the plate |29 and to the side of the projecting portion |46 of the plate |30. A plate I5| is welded between the plates |29 and |30 between the rollers |49. A substantially horizontal pin |52 is supported by the plates and |5| and carries thereon sheaves I 53 and 54 which form a part of the elevator mechanism 2| for lifting the head on the column |23. To cooperate with the sheaves |53 and |54, sheaves |55, |56, and |51 are mounted at the upper end of the column |23 by means of a platform |58. These sheaves |55, |56, and 51 are carried in a housing 58' the first sheave |55 is set diagonally, and the sheaves |56 and |51 are placed substantially parallel to the front face |41 of the column |23. As shown in Fig. 9, a lead-in sheave |59 is mounted on a swinging bracket |60 carried by a support |6| which is secured to the far side of the front plate |59 of the head 26. For operation of the elevator means 2| a cable |60 is carried back from a suitable winch on the tractor which pulls the scraper device, this cable being carried under the sheave |60a and bent upward at |6I', Fig. l. The cable is passed over the sheave |55 and down and around the sheave |53, as indicated at |62. As indicated at |53 in Figs. 4 and 9, the cable is passed up from the sheave |53 to, and then over, the sheave |56, from whence it is carried down, as indicated at |64, to the sheave |54. The cable is then passed under the sheave |54 and thence up and over the sheave |51, the end of the cable then being carried down from the sheave |51, as shown in Fig. 1, to a suitable anchor |96 at the side of the head 26. When it is desired to lift the front end of the frame I5, the cable |59 is pulled forward, as indicated by the arrow |61 in Fig. 1, with the result that the loops of cable extended over the sheaves |53 to |51 are shortcned, exerting a lift on the lower sheaves |53 and |54 which is transmitted through the pin |52 to the head 26, lifting the same under control of the operator, so as to raise the frame I5 from its position of Fig. l through any desired intermediate position, to its fully raised position of Fig. 2, which is referred to as the carrying position of the device.

In addition to the sheaves 12, 13, 15, 1G, 11, and 18 which are mounted on the upper rear part of the bowl I9, the bowl operating means 22 in- -cludes sheaves |68 and |99 which are mounted on the near side of the frame l5, sheaves |17) and |1| which are mounted on the far side of the frame I5, a lead-in sheave |12 mounted in a diagonal position ahead of the sheaves |68 and |69 so as to lead a cable to sheave |58, and leadin sheaves |13 and |14 whichl are mounted on the head 26 in the positions shown in Figs. 1, 3, 4, and 9. The lead-in sheave |14 is carried in a clevis |15 which swings on a vertical axis in a -bracket |16, Fig. 9. The cable 19 of the bowl operating means 22 is led from a suitable winch carried by the tractor to the lead-in sheave |14, as indicated at |15. The cable passes under the sheave |14 and thence upward at |16 to the sheave |13. It passes over the sheave |13 and thence forward at |11 to the sheave |12. From the lead-in sheave |12 the cable passes up and over the sheave |68, from whence it is continued forward at |19 to the sheave 15. It is passed down around the sheave 15 and back at |19 to Vered position and raised position relative tosaid fbowl member; toggle means for moving said apron between raised andlowered positions, said toggle means comprising a first link member pivthe lower part'of the sheave |69, and is then carried up and around the sheave |69 and brought forward at |80, Fig. 3, to the upper part of sheave 16. The cable is then passed Adown from the sheave 1S and then under the sheave 12, to be carried across at IBI through the'guide tube 80, Fig. 5, to the lower part of the sheave 13, under which the cable is then carried to the sheave 11, as indicated at |82, Fig.,5. As shown in Fig. 3, the cable is carried up over the sheave 11 and then forward at |83 to the sheave |10. The cable is then carried down around sheave and is brought rearward at |84 to the under part of sheave 18 over which it is passed and then carried forward at |85 to sheave |1|. After being passed down over the sheave I1 the cable is carried rearward at |36 to an anchor |81, Fig. 5, which is carried by the bowl I9. When the cable 19 is in eiect shortened by pulling forward on the front end thereof, the loops of cable extending over the sheaves 15, 16, 11, and 18, |68, |69, |1, and |1| will be shortened and the bowl will be swung forward and upward to an extent determined by the shortening of these cable loops.

Although we have shown a workable and commercial form of our invention, it will be recognized that certain parts or elements thereof may be replaced by other parts of equivalent function without departing from the spirit of the invention; therefore, the invention is not limited to the details of the foregoing disclosure but should be accorded the full scope of the following claims.

We claim as our invention:

l. In an earth working device of the character described, the combination of: a frame member;

a bowl member mounted on said frame so as to be moved between working position and carrying.

and dumping positions; means for so moving said bowl member; an auxiliary load carrying member mounted so as to have movement between operative and inoperative positions relative to said bowl member; and means disposedso as to be out of operative engagement with said bowl when the same is in said dumping and working positions and so asv to receive movement from said bowl member as the same is moved between said working position and said carrying position and to transmit said movement to said auxiliary member to accomplish movement thereof between said inoperative and operative positions.

2. In a scraper device of the character described, the combination of: a frame member; a bowl member mounted on said frame member so as to be moved from working position to a carrying position; an apron mounted on said frame member so as to be moved'between lowered position and raised position relative to said bowl member; toggle means for moving said apron between raised and lowered positions, said toggle means comprising a rst link member pivotally connected to said apron and a second link member pivotally connected to said rst link member and to said frame member; and means carried by said bowl member so as to engage said toggle means and actuate the same whereby it will move said apron between said raised and lowered positions in consequence of the movement of said bowl member.

3. In a scraper device of the character described, the combination of a frame member; a bowl member mounted on said frame member so as to be moved from dumping position to working position and from working position to'a carrying position; an apron mounted on said frame member so as to be moved between lowotally connected to said apron and a second link member pivotally connected to said rst link member and to said frame member; and means carried by said bowl member-so as to engage said togglemeans as said bowl member moves between said working position and said carrying position to actuate saidl toggle means whereby it will move said apron between said raised and lowered positions in consequence of the movement of said bowl member.

4. In an earth Working device of the character described, the combination of: a frame member; a bowl mounted on said frame member so as to be moved from an intermediate working position upward to dumping position and downward to carrying position; an engager moving with said bowl; means for moving said bowl between said positions; an apron mounted so as to have movement between raised andlowered positions relative to said bowl member; and means holding said apron in said raised position when said bowl is in said dumping and working positions, said means being disposed out of engagement with said engager when said bowl is in said dumping position and being actuated by the movement of said engager as said bowl is moved downward from said working position to said carrying position.

5. In a scraper device of the character described, the combination of: a frame member; a bowl member mounted on said frame member so as to be moved from dumping position to working position and from working positionv to a carrying position; an apron mounted on said frame member so as to be moved between lowered position and raised position relative to said bowl member; toggle means for moving said apron between raised and lowered positions, said toggle means comprising a first link member pivotally connected to said apron and a second link member pivotally connected to said rst link member and to said frame member; and a member moving with said bowl member so as to engage said toggle means as said bowl member moves between said working position and said carrying position to actuate said toggle means whereby it will move said apron from raised to lowered position as said bowl member is moved from working position to carrying position, said member being out of engagement with said toggie means when said bowl member is raised above said working position.

6. In an earth working device of the character described, the combination of: a frame member;

a bowl member mounted on said frame member so as to be moved between working position and carrying and dumping positions; cable means operative to so move said bowl member; an auxiliary load carrying member mounted so as to have movement between operative and inoperative positions relative to said bowl member; and

7. In a scraper deviceA of the character delscribed, the combination of: a frame member; mainload carrying member mounted on said `frame member so as to be moved directly from an` extreme dumpingi position to an intermediate from inoperative position to operative position; f

and means normally holding said auxiliary member insaid inoperative position when said main loadv carrying member is in said dumping and working positions," and being operative only in consequence of movement of said main load carrying member from said working position to said carrying position to move said auxiliary load carrying member from inoperative, to operative position.

JOHN M. CORBET'I.

ROBERT BRUCE MAGEE. 

